Centrifugal pump



V 'A. J. HARLAMOFF CENTRIFUGAL PUMP Filed Aug. 18, 1944 7 AMOFF @imn ,477@6/1/5 VM 1w VENTOR.

April 1, 1947.

Patented Apr. l, i947 2,418,258 CENTRIFUGAL PUMP AAnatol J. Harlamoff, South Gate, Calif., assignor to A. 0. Smith Corporation, Milwaukee, Wis.; a corporation of New York i Application August 1s, 1944, serial No. 550,041

s claims (cl. ics-111) r i J This invention relates to a centrifugal pump and more particularly to the construction of the axial thrust bearings therefor.

One of the principal objects of the invention is to reduce the wear on the axial thrust bearings. 'Another object of the invention is to provide for lubrication of thel principal bearing by thel iluid being pumped. p

Another object is to simplify the construction of the pump to thereby facilitate assembly and bearing adjustment.

Other objects will appear hereinafter in connection with the description of avpreferred embodiment of the invention illustrated in the aclength keyed upon the end of the pump shaft 8 which extends through the rear wall I of housing i to be driven by a motor or other suitable means, not shown.

The wall 1 has a flanged cylindrical wear ring d disposed in the opening for shaft 8 and adapted to closely encircle a sleeve on the shaft to seal the same. The wall 'I also'has an intermediate cylindrical portion 9 which houses the rear thrust bearing disc it.

The bearing disc I. is made of carbon or metal impregnated carbon such es Morganite and held in place by a flanged cylindrical outer casing I i into which it is pressed in manufacture. Bolts I2 pass through the ilange of casing II, through the carbon bearing disc I0, through the flange of wear ring l and into the rear Wall l of housing I to secure the members together.

The bearing disc I has a portion of its front surface exposed to be engaged by a bearing plate I! keyed to shaft il at the inner end of impeller hub 8. The bearing I0 thus serves to limit the rearward movement of impeller 4 and of shaft l8.

The forward thrust bearing I4 comprises a circular disc oi similar carbon material mounted in a flanged plate I5 secured to the flat end or shaft 8 by central bolt IE. The diameter oi' plate I5 is larger than that of shaft 6 so that the plate overhangs the front oi the impeller hub I and pra'- vents the latter from coming oi! the end of the shaft. The'plate I5 may be additionally secured tothe hub 5 by bolts I1.

The` bearing disc I4 has its entire front-surface exposed to be engaged by the iiat rear surface of a. central bearing block I8 which has a cylindrical forwardly extending support I9 held in a hollow central plug 20. A key 2| between support I9 and plug 20 prevents the block I8 from turning.

The bearing clearances for both bearings Il and I4 are adjusted by an adjusting screw 22 at the forward end of plug 20 and which presses axially against the end of support I8. A stream lined cap 23 is threaded onto the forward end of plug 20 to cover the screw 22 and its lock nut I4. The plus 20 is held axially oi' noszle I by radial webs 25 integrally cast with it and the nonzle.

The forward bearing I il may be lubricated by the fluid being pumped by providing a diagonal passage 2B through block I l to the center of the Fluid passes from the pump intake bearing. through passages 26 to the center of the bearing and from thence it is thrown radially outward between the bearing surfaces oi' disc Ii and block I8 as the disc I 4 rotates.

By disposing the principal thrust bearing close to the center of hub E and shaft i the actual speed of movement of one bearing surface over the other is reduced to a minimum.v The adjustment of the bearing tightness by screw 22 also serves to adjust the tightness oi bearing I0 an to hold the impeller 4 in place.

Suitable cylindrical weer rings 21 and 28 secured on the nozzle 3 and iront shroud 2! of lmpeller Il, respectively, serve to seal the impeller against leakage of iluid pressure along its torward side. Similar wear rings 30 and 3i secured on the rear wall 1 and rear face oi' the impeller 4, respectively, serve to seal the impeller against` leakage of fluid pressure along its rear side and through the bearing I0. A passage 32 through the impeller near its hub 5 serves to provide a suction on the rear side of the impeller and effect llubrication oi' the wear rings 3l and 3i by a refshaft, a non-galling disc bearing element mounted on the forward side of the hub in axial align, ment with the shaft, an intake nozzle for the impeller having webs carrying a hollow tubular member in axial alignment with the shaft and spaced in front of said bearing disc, a bearing block bearing against the face of said disc, a

shank for supporting said block and extending into said tubular member, and means adjustably determining the llongitudinal position of the shank in said tubular member to adjust the bearing providedby said disc and block.

-2. In a pump of the class described having an impelier with its hub mounted on the end of a shaft, a non-galling disc bearing element mounted on the forward side of the hub in axial alignment with the sh'aft, an intake nozzle for the impeller 'having webs carrying a hollow tubular member in axial alignment with the shaft and spaced in front of said bearing disc, a bearing block bearing against the face of said disc, a shank for supporting said block and extending into said tubular member, and a threaded Stud in the forward end of the tubular member and bearing axially against the end of the shank to adjust the bearing provided by the disc and block. l

3. In a pump of the class described having an impeiler with its hub mounted on the end of a shaft, a non-galling forward disc bearing element mounted on the 'forward side of the hub in axial alignment with the shaft, an intake nozzle for the impeller having webs carrying a hollow tubular member in axial alignment with the shaft, and spaced in front of said bearing disc, a bearing block bearing against the face of the disc, a shank for supporting said block and extending into said tubular member, a rearward thrust bearing disposed at the rear end of the hub `to resist rearward axial thrust of the irnpeller, and means adjustably determining the longitudinal position of the shank in said tubular member to adjust both the forward and rearward thrust bearing.

ANATOL J. HARLAMOFF.

REFERENCES CITED The following references are of record inl the file of this patent:

UNITED STATES PATENTS Number Name Date 1,100,327 Remington June 16, 1914 1,132,413 Whipple Mar. 16, 1915 1,340,091' Trane May 11, 1920 t FOREIGN PATENTS Number Country Date 3,076 French Feb. 9, 1903 

